The Maacama Fault is a right lateral-moving (dextral) geologic fault located in the Coast Ranges of northwestern California. It is considered to be the northernmost segment of the Hayward Fault subsystem of the San Andreas Fault zone. Creep along the Maacama is about 8 mm per year, consistent with the steady movement along the rest of the Hayward Fault system. It is also capable of producing large earthquakes.
- LARSEN, Mort, PRENTICE, Carol S., KELSEY, Harvey M., ZACHARIASEN, Judith, and ROTBERG, Gabriel L. (2005). "Paleoseismic Investigation Of The Maacama Fault At The Haehl Creek Site, Willits, California". The Geological Society of America. Retrieved 12 December 2008.